Samuel



SAMUEL C. TAYLOR, OF TOLEDO, OHIO.

Letters Patent No. 74,629, dated February 18, 1858.

IMPROVEMENT IN DENTAL INSTRUMENTS. v

@te 5ttehu1cnfernt tu it time @etten tttnt mit mating TO ALL WHOM yI'l MAY'CONCERN:

Be it known that I, SAMUEL C. TAYLOR, of Toledo,.in the county of Lucas, and State of Ohio, have invented certainnew and'usoful Improvements in a Dental Instrument, whielrI term an Automatic Pluggcrg andI do hereby declare the following to be a full, clear, and exact description ot the construction and operation of the same, reference being had to the accompanying drawipgs, making a part of this speciiicationfin which- Figure 1 represents an external viewl of the instrument, und `Figure 2 represents a vertical section through the same. Y p

Similar letters of reference, where they occur in the separate figures, denote like parts of the instrument in both of the drawings.

My invention consists, rst, in combining with an upright mullet, which may operate by its own gravity or be accelerated by a spring, a permanentand pivoted lever, so that the operator with one and the same hand may raise the mallet and let it full, and steadily hold the instrument and operate it.

My invention further consists in combining with a pivoted lever arod and hook, for catching upon the toepiece or crotchetfY and raising up the mullet and then tripping it, to let the mallet fall, as will be explained.

My invention further consists in a ready means of yincreasing the power of the spring upon the mullet, or diminishing it at pleasure, or removing it entirely, as the condition of the work to be done may require.

To enable othersskilled in the art to make and use my invention, I will proceed to describe the same with reference to the drawings l'and the letters of reference thereon.

A is an external case or hollow tube, for containing much of the `mechanism of the instrument. To the lower end of the case there is screwed a nut, a, to which the socket B is united by having its shank 6 to passl through the nut, through a'rubber or other spring, c, and'held therein by a washer, 1, and pin, 2, so that the socket can be freely turned around or in the case, but at the same time held thereto by a spring-attachment, for a purpose to be hereafter explained. In the socketB theplugging-tool C, of any known kind, is placed, removed,

replaced, or exchanged forgot-hers, as may be required. On the case is permanently secured a projecting lever or handle, D, by which the instrument is mainly held by the operator, andto the under side ot` this handle D there is pivotecl, as at 3, a vibrating-lever, E, the free end of which is grasped in the hand that holds the lever D, tq raise up the mallet, and the spring 4, between the levers, restores the hinged one E to the position shown in tig. 1, when the grasp'of the hand or pressure of4 the fingers upon it is removed or relaxed. To that end of the lever E which projects into the'case A there is connect-ed, by alink, 5, a rod, 6, which extends upward to near the top of the case, land its extremo upper end is furnished with a hook, 7, which catches over the erotche' or toe-piece e to draw down one of its ends, it being pivotcd ut 8, which drawing down correspomlingly raises up its other end, 'to which the plunger or mallet F is connected by a link, (Z,

As the malletF is raised up, it, under some circumstances, compres/ses the coiled springf around it, so that, when the hook 7 slips offrono the crotchet or toe-piece, as it will do after drawing it down. below its centre ot' motion, the reaction ofthe spring brings down the mallet with an increased force over that oi' its own gravity,

and that the blow of the inallet F upon the shank of thesoclcet may be noiseless, or comparatively so, I insert u. piece of hard wood, or equivalent hard non-conducting material, in the end of the mullet, which strikes upon the shank b.

The instrument is so arranged as that the mallct may fall with its gravity'only upon the shank, socket, or plugging-tool, and thus give a very delicate blow, or the recoil of the spring may be connected with the mallet so as to graduate `the blow, as follows: Upon the exterior of the oase A there is a clasp, g, to which is pivoted a. spring-dog, lz, to which clasp are attached rods z', (one only being seen in dotted lines in iig. l, but both alike, and one on each side,) that extend upward, Vand are fastened to a cap or button, 9, and on the case A there are, teeth, n, upon which the dog or catch /i'will take and hold.

Byfsliding the clasp downward the spring `is compressed andY made stronger, and by sliding it upward the spring is relaxed, 'and its recoil and consequentthrow oi the mallet less violent, so that the blow maybe regulated anywherc between the gravity of the malletalone to the extreme of' the power of the springw The blow,

it will be erceived, is not transmittedthr'culrh the case or bod of the instrument, which would canse a 'at-aud P e y .l

unsteadiness of Vthe instrument in thehands ofthe opera-tor, but is transmitted through the shank it und springcushion? to the plugging-tool C, without moving or jarring the body of the instrument.j The-turning of the shank`is important, as it allows the curved end of the tool to work under any portion ofthe cavity that is being plugged'. v y

What I claim as my invention, and desire to secure by Letters Patent, is-

1. In combination with the mallet and the trip-motion, a permanent and a hinged lever, so that the user may hold the instrument and operate the 'friallet atthe same time, and by one and the same hand, substantially as described. A

2. I also claii, in combination with a"pivoted lever and toe-piece or erotchet, ing, drawing down, and releasing said toc-piece, substantially as described.

3. I also claim, in combination with the mullet and a spring,r in a plugging-instrument, the sliding dog or catch and the teeth, for the purpose of compressing, graduating, or regulating the action of the spring upon the mallot, Without changing thexextent of motion of the leven.` E, substantnliy as described. v

a ro dV anti hook, for ea tch- S. C. TAYLOR.

Witnesses:

A. B. STOUGHTON, EDM. F. BROWN. 

